Fix broken link to guestbook example

[asimuleo]

Description

This PR fixes broken link to the guestbook example in the following document:
content/en/docs/concepts/overview/working-with-objects/labels.md

The original link was pointing to the /guestbook directory, which has now been moved to /web/guestbook

https://github.com/kubernetes/examples/tree/master/guestbook/
These have been updated to point to the correct path:

https://github.com/kubernetes/examples/tree/master/guestbook/

Issue

no issue found

Closes: #

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: asimuleo / name: ImHyuk (67ca9a9)

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[windsonsea]

Hi @asimuleo , please only update the english version in this PR.
zh and more localization variants can be handled by different teams.
/hold

[asimuleo]

Hi @windsonsea, I update this PR. Thank you!

[stmcginnis]

Link goes to correct place now, and only includes English changes.

/remove-language zh
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d7fedb86de6e6fca783c04846391dacd7184d815

[dipesh-rawat]

/unhold
/remove-area localization

[dipesh-rawat]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dipesh-rawat

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